<template>
	<view class="u-wrap">
		<cu-custom bgColor="bg-gradual-blue"><block slot="content">发现更多</block></cu-custom>

		<view class="u-search-box">
			<view class="u-search-inner">
				<u-icon name="search" color="#909399" :size="28"></u-icon>
				<text class="u-search-text">搜索您想订阅的消息推送</text>
			</view>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view
					v-for="(item, index) in tabbar"
					:key="index"
					class="u-tab-item"
					:class="[current == index ? 'u-tab-item-active' : '']"
					:data-current="index"
					@tap.stop="swichMenu(index)"
				>
					<text class="u-line-1">{{ item.name }}</text>
				</view>
			</scroll-view>
			<block v-for="(item, index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current == index">
					<view class="page-view">
						<view class="class-item">
							<!-- <view class="item-title">
								<text>{{ item.name }}</text>
							</view> -->
							<view class="item-container">
								<view class="thumb-box shadow-warp" v-for="(item1, index1) in item.items" :key="index1">
									<view class="thumb-box-child1 margin-left-xs">
										<image class="item-menu-image" :src="item1.icon" mode=""></image>
										<view class="margin-left-xs text-bold">{{ item1.name }}</view>
									</view>
									<view class="flex flex-column thumb-box-child2 justify-center">
										<view
											@click="toSubscribe"
											style="width: 70%;background-color: #ED5346;padding: 7rpx;margin-left: 10%;"
											class="text-white flex justify-center align-center shadow-blur"
										>
											订阅
										</view>
										<view style="" class="font-size-sm text-color-base margin-top-xs">{{ item1.count }}人订阅</view>
									</view>
								</view>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
import classifyData from '@/common/classify.data.js';
export default {
	data() {
		return {
			tabbar: classifyData,
			scrollTop: 0, //tab标题的滚动条位置
			current: 0, // 预设当前项的值
			menuHeight: 0, // 左边菜单的高度
			menuItemHeight: 0 // 左边菜单item的高度
		};
	},
	computed: {},
	methods: {
		toSubscribe() {
			uni.navigateTo({
				url: 'detail/subscribe'
			});
		},
		getImg() {
			return Math.floor(Math.random() * 35);
		},
		// 点击左边的栏目切换
		async swichMenu(index) {
			if (index == this.current) return;
			this.current = index;
			// 如果为0，意味着尚未初始化
			if (this.menuHeight == 0 || this.menuItemHeight == 0) {
				await this.getElRect('menu-scroll-view', 'menuHeight');
				await this.getElRect('u-tab-item', 'menuItemHeight');
			}
			// 将菜单菜单活动item垂直居中
			this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
		},
		// 获取一个目标元素的高度
		getElRect(elClass, dataVal) {
			new Promise((resolve, reject) => {
				const query = uni.createSelectorQuery().in(this);
				query
					.select('.' + elClass)
					.fields({ size: true }, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					})
					.exec();
			});
		}
	}
};
</script>

<style lang="scss" scoped>
.u-wrap {
	height: calc(100vh);
	/* #ifdef H5 */
	height: calc(100vh - var(--window-top));
	/* #endif */
	display: flex;
	flex-direction: column;
}

.u-search-box {
	padding: 18rpx 30rpx;
}

.u-menu-wrap {
	flex: 1;
	display: flex;
	overflow: hidden;
}

.u-search-inner {
	background-color: rgb(234, 234, 234);
	border-radius: 100rpx;
	display: flex;
	align-items: center;
	padding: 10rpx 16rpx;
}

.u-search-text {
	font-size: 26rpx;
	color: $u-tips-color;
	margin-left: 10rpx;
}

.u-tab-view {
	width: 200rpx;
	height: 100%;
	background: #ffffff;
}

.u-tab-item {
	height: 110rpx;
	background: #fff;
	box-sizing: border-box;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 26rpx;
	color: #444;
	font-weight: 400;
	line-height: 1;
}

.u-tab-item-active {
	position: relative;
	color: $u-type-primary;
	font-size: 30rpx;
	font-weight: 500;
	background: #f1f1f1;
}

.u-tab-item-active::before {
	content: '';
	position: absolute;
	border-left: 3px solid $u-type-primary;
	height: 100%;
	left: 0;
}

.u-tab-view {
	height: 100%;
}

.right-box {
	background-color: #f1f1f1;
}

.page-view {
	padding: 16rpx;
}

.class-item {
	margin-bottom: 30rpx;
	border-radius: 8rpx;
}

.item-title {
	font-size: 30rpx;
	color: $u-main-color;
	font-weight: bold;
	margin: 10rpx 0;
}

.item-container {
	display: flex;
	flex-wrap: wrap;
}

.thumb-box {
	background-color: #fff;
	width: 100%;
	display: flex;
	align-items: center;
	flex-direction: row;
	margin: 20rpx 10rpx;
	height: 140rpx;
	padding: 10rpx;
}

.thumb-box:nth-of-type(1) {
	margin-top: 0 !important;
}

.item-menu-image {
	width: 70rpx;
	height: 70rpx;
	border-radius: 100rpx;
}
.thumb-box-child1 {
	display: flex;
	flex-direction: row;
	width: 75%;
	align-items: center;
}
.thumb-box-child2 {
	width: 25%;
}
</style>
